Over the years network theory has proven to be very versatile and rapidly expanding methodology to investigate various complex systems, turning out recently to give quite unparalleled insight to their structure, function, and response through data analysis, modeling, and simulation. For social systems in particular the network approach has empirically revealed a modular structure due to interplay between the network topology and link weights/tie strengths between nodes/individuals. This inspired us to develop a simple network model that could catch some salient features of mesoscopic community and macroscopic topology formation during network evolution. Our model is based on two fundamental mechanisms of network sociology for an individual to find new friends, namely {it cyclic closure} and {it focal closure}, which are mimicked by local search-link-reinforcement and random global attachment mechanisms. In addition the model includes node deletion mechanism with its links simultaneously removed, which corresponds for an individual to depart from the network. Our model turned out to produce many features of the empirically studied large social network, and could possibly be used for studying various collective social phenomena such as spreading, formation, and evolutionary processes.
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